Silent Editor's answer

The frontend is React 19 with TypeScript, bundled by Vite. PDF rendering and text extraction use PDF.js (the same engine Firefox uses for its built-in PDF viewer). PDF assembly and export use pdf-lib. OCR is powered by Tesseract.js running client-side via WebAssembly. The backend (just billing and auth, no document processing) runs on Cloudflare Workers with D1 as the database. Hosting is Cloudflare Pages with edge caching. Payments go through Stripe.

Silent Editor's answer

Your PDF never leaves your computer. That's the whole point. Most PDF editors (even the "free" online ones) upload your file to their servers to do the processing, and you just have to trust them with whatever's in that document. Silent Editor does everything locally in your browser using JavaScript and WebAssembly. There's no upload step, no server-side rendering, nothing. It even ships with runtime network guards and a Content Security Policy that architecturally prevent document bytes from going anywhere. It's not a privacy promise, it's a privacy guarantee baked into the code.

Silent Editor's answer

If you're editing a contract, tax return, medical record, NDA, or anything you wouldn't casually email to a stranger, then uploading it to a random PDF website should feel wrong. Silent Editor lets you skip that entirely. Beyond privacy, there's no account required, no software to install, no watermarks on the free tier, and it works on any modern browser. You open the page, drop your file in, edit, and download. That's it. Competitors either want your data, your email, or $20/month for Adobe. Silent Editor sits in a different lane.

Silent Editor's answer

Anyone who handles sensitive documents and doesn't want to think twice about where their data goes. In practice that's lawyers, accountants, freelancers, students, small business owners, and really anyone who's ever googled "edit PDF free" and then hesitated before uploading a personal document to some random site. Privacy-conscious professionals are the core, but the simplicity of it (no signup, no download) makes it genuinely useful for anyone.

Silent Editor's answer

It's a Sweden-based indie project. The idea came from a simple frustration: every time you need to make a small change to a PDF, you're either paying for Adobe or uploading your file to some cloud service you know nothing about. Neither felt right. So the founder built a PDF editor that runs entirely in the browser, where the privacy model is enforced by architecture rather than a terms-of-service page nobody reads. It started as a prototype with React and PDF.js and grew into a full editing suite with text replacement, signatures, page operations, OCR, and multiple export modes. It's still being built in the open with a generous free tier.

Silent Editor's answer

Honestly, Silent Editor is still early stage and in open beta, so there isn't a public customer list to share yet. The product is being used by individual professionals and small teams, but specific names or organizations haven't been disclosed. As it grows, that picture will fill in. Right now the focus is on building something genuinely great before worrying about logos on a landing page.